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EP3954369A1 - Salze und prodrugs von 1-methyl-d-tryptophan - Google Patents

Salze und prodrugs von 1-methyl-d-tryptophan Download PDF

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Publication number
EP3954369A1
EP3954369A1 EP21187070.4A EP21187070A EP3954369A1 EP 3954369 A1 EP3954369 A1 EP 3954369A1 EP 21187070 A EP21187070 A EP 21187070A EP 3954369 A1 EP3954369 A1 EP 3954369A1
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Prior art keywords
methyl
indoximod
nlg
salt
acid
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English (en)
French (fr)
Inventor
Mario Mautino
Sanjeev Kumar
Firoz Jaipuri
Jesse Waldo
Hima Potturi
Hong Zhuang
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Lumos Pharma Inc
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Lumos Pharma Inc
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Publication of EP3954369A1 publication Critical patent/EP3954369A1/de
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    • C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
    • C07D209/04—Indoles; Hydrogenated indoles
    • C07D209/10—Indoles; Hydrogenated indoles with substituted hydrocarbon radicals attached to carbon atoms of the hetero ring
    • C07D209/18—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
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    • C07D209/20—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals substituted additionally by nitrogen atoms, e.g. tryptophane
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    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
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    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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    • C07F9/02—Phosphorus compounds
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    • C07F9/6564—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms
    • C07F9/6571—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having phosphorus atoms, with or without nitrogen, oxygen, sulfur, selenium or tellurium atoms, as ring hetero atoms having phosphorus and oxygen atoms as the only ring hetero atoms
    • C07F9/6574—Esters of oxyacids of phosphorus
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    • C07K5/06017—Dipeptides with the first amino acid being neutral and aliphatic
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    • C07K5/06008—Dipeptides with the first amino acid being neutral
    • C07K5/06017—Dipeptides with the first amino acid being neutral and aliphatic
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    • C07K5/06017—Dipeptides with the first amino acid being neutral and aliphatic
    • C07K5/0606—Dipeptides with the first amino acid being neutral and aliphatic the side chain containing heteroatoms not provided for by C07K5/06086 - C07K5/06139, e.g. Ser, Met, Cys, Thr
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Definitions

  • the present disclosure is related to compounds for inhibition of indoleamine-2,3-dioxygenase pathway, in particular salts and prodrugs of indoximod with enhanced pharmacokinetic properties relative to indoximod
  • IDO1 indoleamine-2,3-dioxygenase
  • TDO2 tryptophan-2,3-dioxygenase
  • IDO1 plays an important role in the regulation of immune responses by triggering anergy on reactive effector T cells and by modulating differentiation and activation of regulatory T cells (Tregs).
  • the IDO enzyme is involved in pathway that comprises all proteins that directly or indirectly contribute to modulate the immunosuppressive functions dependent on IDO activity, including proteins that mediate induction of IDO expression, activation of enzymatic activity by reductases, post-translational modifications that regulate activity, protein degradation, and the interpretation and transmission of the signals elicited by low concentrations of Trp and the presence of Trp catabolites [collectively known as kynurenines (Kyns)] including catabolic stress sensors integrated into the General Control Nonrepressed-2 (GCN2) pathway, the Aryl Hydrocarbon Receptor (AhR) pathway, and the mammalian Target Of Rapamycin (mTOR) pathways.
  • GCN2 General Control Nonrepressed-2
  • AhR Aryl Hydrocarbon Receptor
  • mTOR mammalian Target Of Rap
  • direct pharmacological inhibition of IDO1 enzymatic activity or inhibition of the upstream factors that activate IDO1 enzyme or inhibition of the downstream effects of IDO1 enzymatic activity should stimulate an immune response by multiple mechanisms that may involve preventing anergy of effector T cells, reactivating anergic effector T cells, preventing the activation of regulatory T cells, promoting phenotypic conversion of Tregs to pro-inflamatory TH17 cells and promoting phenotypic reprogramming of immunosuppressive dendritic cells into immunostimulatory dendritic cells.
  • One of the first IDO pathway inhibitors studied in preclinical models has been 1-methyl-DL-tryptophan (1mT), a racemic mixture of enantiomers, which was shown to mediate immune dependent rejection of allogeneic fetuses in mice [3] and immune dependent enhancement of antitumor activity of chemotherapy and radiotherapy [4]. Each one of these enantiomers shows different biological properties.
  • both isomers are capable of restoring T cell proliferation in an MLR assay with IDO+ dendritic cells as the stimulator cells, or in syngeneic antigen-dependent T cell proliferation assays using IDO+ DCs isolated from tumor draining lymph nodes [6].
  • IDO+ DCs IDO+ DCs isolated from tumor draining lymph nodes
  • indoximod does not show inhibition of enzymatic activity in other types of assays, it shows inhibition of enzymatic activity in this co-culture assay, as seen by reduced Trp degradation and Kyn synthesis.
  • indoximod does not show inhibition of IDO1 enzymatic activity in vitro, but somehow mimics the biological consequences of IDO1 inhibition in vivo or in cell based assays.
  • Experimental evidence from a number of research laboratories points to the conclusion that indoximod is participating in the inhibition of the IDO1 pathway.
  • indoximod to relieve immunosuppression in vivo and in vitro is supported by studies performed in several laboratories in murine preclinical models. Indoximod has demonstrated activity in the following biological assays:
  • indoximod is being investigated in human clinical trials for cancer indications.
  • Indoximod is being studied in several cancer indications in combination with different chemotherapeutic and biological immunotherapeutic agents, such as docetaxel, paclitaxel, gemcitabine, Nab-paclitaxel, temozolomide, ipilimumab, sipuleucel-T, or vaccines.
  • chemotherapeutic and biological immunotherapeutic agents such as docetaxel, paclitaxel, gemcitabine, Nab-paclitaxel, temozolomide, ipilimumab, sipuleucel-T, or vaccines.
  • Indoximod is orally bioavailable with a favorable pharmacokinetic (PK) profile (Tmax: ⁇ 3h; half-life: -10 h) and an excellent safety profile.
  • PK pharmacokinetic
  • Pharmacokinetic studies in patients have demonstrated that indoximod shows a linear PK profile at doses of up to 800 mg/dose, with maximum plasma concentration (Cmax) of 15 ⁇ M and drug exposure (AUC (0-last) ) levels of ⁇ 100 ⁇ M.h.
  • Cmax maximum plasma concentration
  • AUC (0-last) drug exposure
  • increasing doses above 800 mg/dose up to 2000 mg/dose does not result in a linear or proportional increase in Cmax or drug exposure, thus potentially limiting the therapeutic activity of this investigational drug.
  • MLR Mixed-lymphocyte response
  • indoximod such as spray dry dispersions or salts or indoximod prodrugs in different salt forms would increase solubility and absorption rate or reduce blood clearance to levels that increase the maximum concentration and exposure to indoximod.
  • prodrugs and its salts that could result in increases parameters of exposure when dosed orally and in pill (capsule or tablet) dosage formulation.
  • the invention describes compounds and pharmaceutical compositions comprising compounds according to Formula 1a and 1b Wherein A -p n is an inorganic or organic anion and C +p m is an inorganic cation as defined herein.
  • the invention comprises compounds and pharmaceutical compositions comprising compounds according to formula (2) Where R 1 , R 2 and mH n A are defined herein
  • the present disclosure provides
  • Indoximod (1-methyl-D-tryptophan, D1mT) is an investigational inhibitor of the indoleamine-2,3-dioxygenase (IDO) pathway that is being tested in several human clinical trials for multiple cancer indications, in combination with standard and experimental chemotherapeutic and immunomodulatory agents and active immunotherapies.
  • IDO indoleamine-2,3-dioxygenase
  • CD8 + effector T cells become anergic and unable to proliferate.
  • regulatory T cells CD4 + CD25 + FoxP3 +
  • IDO + DCs regulatory T cells
  • IDO + DCs regulatory T cells
  • IDO + DCs regulatory T cells
  • IDO + DCs regulatory T cells
  • IDO + DCs regulatory T cells
  • IDO + DCs regulatory T cells
  • IDO + DCs regulatory T cells
  • IDO + DCs regulatory T cells
  • Indoximod is capable to revert these processes, allowing effector T cells to proliferate and directing reprogramming of Tregs to a TH17 helper-like phenotype.
  • these effects are mediated by indoximod with an EC50 of ⁇ 30 ⁇ M [6].
  • antitumor effects, stimulation of effector T cells and reprogramming of Tregs in the draining lymph nodes requires daily doses of ⁇ 500 mg/kg, with exposures > 300 ⁇ M.h.
  • the present invention describes compounds of formula 1a, 1b and formula 2 that produce a higher exposure and maximum serum concentration of indoximod upon oral administration, compared to oral administration of equivalent molar doses of indoximod.
  • a salt of indoximod is disclosed.
  • the salt has a structure according to Formula 1a: wherein A -p n is an inorganic or organic anion in an ionization state ⁇ p .
  • the anion is present at a stoichiometric ratio n that ensures molecular charge neutrality.
  • the anion A -p n is selected from the group consisting of chloride, phosphate, sulfate, mesylate, besylate, acetate, ascorbate, aspartate, glutamate, glutarate, lactate, maleate, malonate, oxalate, succinate, fumarate, tartrate and citrate.
  • the anion is presented at a stoichiometric ratio n such that the resulting salt is charge neutral.
  • the anion has an ionization state p of -1, -2 or -3 and is presented at a stoichiometric ratio n of 1, 1/2 or 1/3, respectively, such that the stoichiometric conditions of charge neutrality are satisfied.
  • the phosphate is HPO 4 -2 , and the HPO 4 -2 is present at a stoichiometric ratio n of 0.5.
  • the phosphate is HPO 4 - , and the HPO 4 - is present at a stoichiometric ratio n of 1.
  • the sulfate is SO 4 -2 , and the SO 4 -2 is present at a stoichiometric ratio n of 0.5.
  • the mesylate is CH 3 SO 3 - , and the CH 3 SO 3 - present at a stoichiometric ratio n of 0.5.
  • anion A -p n is Cl - at a stoichiometric ratio n of 1. In another preferred embodiment the anion A -p n is Cl - at a stoichiometric ratio n of 1 and the crystalline form is an anhydrous isoform of Form 1.
  • the salt has a structure according to Formula lb: wherein C +p m is a cation in an ionization state + p .
  • the cation is present at a stoichiometric ratio m that ensures molecular charge neutrality.
  • the c +p m is selected from the group consisting of Li + , Na + , K + , Mg +2 and Ca +2 . In one embodiment, when p is +1, m is 1, and when p is +2, m is 1 ⁇ 2.
  • a prodrug of indoximod is disclosed.
  • the structure of the prodrug, in free base or salt form, is provided in Formula 2:
  • R 1 is -OH, -OC 2 - 3 alkyl, -OCH 2 CH(OH)CH 2 OH, - O(CH 2 ) 2 N(CH 3 ) 2 , -OC 1 - 3 alkyl-R 3 , -NHC ( S ) HR 4 (COOH), -NHC ( R ) HR 4 (COOH), -OC 1-6 alkylR 6 , - OC 1 - 2 alkyl-C ( S ) H(NH 2 )(COOH), or -OC 1 - 2 alkyl-C (R) H(NH2)(COOH).
  • R 1 is -NHC ( S ) HR 4 (COOCH 3 ) or -NHC ( R ) HR 4 (COOCH 3 ).
  • R 2 is -H, -C(O)C ( S ) H(NH 2 )R 4 , -C(O)C ( R ) H(NH 2 )R 4 ,-C(O)CH 2 C (S) H(NH 2 )-C(O)OCH 3 , -C(O)OR 5 , or -C(O)NHR 5 .
  • R 3 is tetrahydropyran or
  • C ( S ) and C ( R ) are carbons with the S or R stereochemistry, respectively.
  • R 5 is -H, C 1 - 6 alkylR 6 , or R 6 .
  • R 6 is selected from the group consisting of -H, aryl, alkylaryl, heteroaryl, cycloalkyl, and heterocycloalkyl, wherein the aryl, alkylaryl, heteroaryl, cycloalkyl or heterocycloalkyl is optionally substituted with one two or three R 7 groups.
  • each R 7 is independently halogen, cyano, nitro, -OR, -N(R) 2 , -SR, -C(O)OR, C 1-6 alkyl, C 1-6 haloalkyl, -C(O)N(R) 2 , -C(O)R, -S(O)R, -S(O)OR, - S(O)N(R) 2 , -S(O) 2 R, -S(O) 2 OR, -S(O) 2 N(R) 2 , -OC(O)R, -OC(O)OR, -OC(O)N(R) 2 , -N(R)C(O)R, -N(R)C(O)OR, or -N(R)C(O)N(R) 2 , wherein R is H or C 1-4 alkyl.
  • R 1 cannot be -OH when R 2 is H.
  • the prodrug cannot be N ⁇ -tert-butoxycarbonyl-1-methyl-D-tryptophan, ethyl N ⁇ -benzyl-1-methyl- D -tryptophanate, or benzyl N ⁇ - (tert- butoxycarbonyl)-1-methyl- D -tryptophanate.
  • HA n is an acid.
  • the acid HA n is selected from the group consisting of PO 4 H 3 (phosphoric acid), SO 4 H 2 (sulfuric acid), HCl (hydrochloric acid), HSO 3 CH 3 (methyl sulfonic acid), C 6 H 5 SO 3 H (benzyl sulfonic acid), acetic acid, ascorbic acid, aspartic acid, glutamic acid, glutaric acid, lactic acid, maleic acid, malonic acid, oxalic acid, succinic acid, fumaric acid, tartaric acid and citric acid.
  • the acid HA n is present at a stoichiometric ratio n such that the resulting prodrug is charge neutral. Accordingly, in one embodiment, the stoichiometric ratio n of the acid HA n is 0, 0.5, 1 or 2 such that the prodrug is charge neutral.
  • the invention also provides prodrugs of indoximod, in their free base or salt form.
  • the prodrugs of indoximod are represented by compounds of Formula 2, wherein
  • HA n is an acid selected from the group consisting of PO 4 H 3 (phosphoric acid), SO 4 H 2 (sulfuric acid), HCl (hydrochloric acid), HSO 3 CH 3 (methyl sulfonic acid), C 6 H 5 SO 3 H (benzyl sulfonic acid), acetic acid, ascorbic acid, aspartic acid, glutamic acid, glutaric acid, lactic acid, maleic acid, malonic acid, oxalic acid, succinic acid, fumaric acid, tartaric acid and citric acid; and n is the stoichiometric ratio of 0, 0.5, 1 or 2 that ensure charge neutrality of the resulting salt.
  • the invention provides prodrugs of indoximod, in their free base or salt form, as represented by compounds of Formula 2,
  • the invention provides prodrugs of indoximod, in their free base or salt form, as represented by compounds of Formula 2, wherein
  • the invention provides prodrugs of indoximod, in their free base or salt form, as represented by compounds of Formula 2, wherein
  • the invention provides prodrugs of indoximod, in their free base or salt form, as represented by compounds of Formula 2, wherein
  • the invention provides prodrugs of indoximod, in their free base or as a pharmaceutically appropriate salt form, as represented by compounds of Formula 2 represented in Table 1.
  • the prodrug substantially includes at least one of the following compounds: (i) ethyl N ⁇ -( L -leucyl)-1-methyl- D -tryptophanate; (ii) 2,3-dihydroxypropyl 1-methyl-D-tryptophanate; (iii) N ⁇ -( L -leucyl)-1-methyl- D -tryptophan; (iv) ethyl N ⁇ -( L -isoleucyl)-1-methyl-D-tryptophanate; (v) N ⁇ -( L -glycyl)-1-methyl- D -tryptophan; (vi) ( S )-5-amino-6-((( R )-1-carboxy-2-(1-methyl-1 H -indol-3-yl)ethyl)amino)-6-oxohexanoic acid; (vii) N ⁇ -( L -ly
  • the invention provides a pharmaceutical composition
  • a pharmaceutical composition comprising salts of indoximod, as represented by compounds of Formula 1a and 1b, wherein A - n is an inorganic or organic anion and C +p m is an inorganic cation in an ionization state and at a stoichiometric ratio that ensures molecular charge neutrality.
  • the invention provides a pharmaceutical composition comprising salts of indoximod, as represented by compounds of Formula 1a, wherein A -p n is an anion selected from the group consisting of chloride, phosphate, sulfate, mesylate, besylate, acetate, ascorbate, aspartate, glutamate, glutarate, lactate, maleate, malonate, oxalate, succinate, fumarate, tartrate and citrate, wherein negative charge p is -1, -2 or -3 at stoichiometric ratio n of 1, 1 ⁇ 2 or 1/3, respectively, so that it satisfies stoichiometric conditions of charge neutrality.
  • a -p n is an anion selected from the group consisting of chloride, phosphate, sulfate, mesylate, besylate, acetate, ascorbate, aspartate, glutamate, glutarate, lactate, maleate, malonate, oxalate,
  • the invention provides a pharmaceutical composition comprising salts of indoximod, as represented by compounds of Formula 1b, wherein C +p m is an cation selected from the group of Li + , Na + , K + , Mg +2 or Ca +2 , wherein positive charge p is +1 or +2 at stoichiometric ratio m of 1 or 1 ⁇ 2, respectively, so that it satisfies stoichiometric conditions of charge neutrality.
  • the invention provides a pharmaceutical composition comprising salts of indoximod, as represented by compounds of Formula 1a, wherein A -p n is an anion selected from the group consisting of BPO 4 -2 (phosphate), SO 4 -2 (sulfate), H 2 PO 4 - (phosphate), Cl - , and CH 3 SO 3 - (mesylate), at stoichiometric ratio n of 0.5, 0.5, 1 or 1, respectively.
  • a -p n is an anion selected from the group consisting of BPO 4 -2 (phosphate), SO 4 -2 (sulfate), H 2 PO 4 - (phosphate), Cl - , and CH 3 SO 3 - (mesylate), at stoichiometric ratio n of 0.5, 0.5, 1 or 1, respectively.
  • the invention provides a pharmaceutical composition comprising salts of indoximod, as represented by compounds of Formula 1a, wherein A -p n is Cl - at a stoichiometric ratio n of 1.
  • the invention provides a pharmaceutical composition comprising salts of indoximod, as represented by compounds of Formula 1a, wherein A -p n is Cl - at a stoichiometric ratio n of 1 and the crystalline form is an anhydrous isoform of Form 1.
  • the invention provides a pharmaceutical composition comprising prodrugs of indoximod, in their free base or salt form.
  • the prodrugs of indoximod are represented by compounds of Formula 2, wherein
  • the invention provides a pharmaceutical composition comprising prodrugs of indoximod, in their free base or salt form, as represented by compounds of Formula 2,
  • the invention provides a pharmaceutical composition
  • a pharmaceutical composition comprising prodrugs of indoximod, in their free base or salt form, as represented by compounds of Formula 2, wherein
  • the invention provides a pharmaceutical composition
  • a pharmaceutical composition comprising prodrugs of indoximod, in their free base or salt form, as represented by compounds of Formula 2, wherein
  • the invention provides a pharmaceutical composition
  • a pharmaceutical composition comprising prodrugs of indoximod, in their free base or salt form, as represented by compounds of Formula 2, wherein
  • the invention provides a pharmaceutical composition comprising prodrugs of indoximod, in their free base or as a pharmaceutically appropriate salt form, as represented by compounds of Formula 2 represented in Table 1.
  • Table 1 Prodrugs of indoximod Cpd Number Structure Name 01 ethyl N ⁇ -( L -leucyl)-1-methyl- D- tryptophanate 02 2,3-dihydroxypropyl 1-methyl- D- tryptophanate 03 N ⁇ -( L -leucyl)-1-methyl- D -tryptophan 04 ethyl N ⁇ -( L -isoleucyl)-1-methyl- D- tryptophanate 05 N ⁇ -( L -glycyl)-1-methyl- D -tryptophan 06 ( S )-5-amino-6-((( R )-1-carboxy-2-(1-methyl-1 H -indol-3-yl)ethyl)amino
  • the invention provides methods of use of compositions of formulas 1 and 2, to modulate the activity of indoleamine-2,3-dioxygenase pathway in a subject in need thereof, comprising the oral administration of therapeutically effective amounts such compositions to such subject in an appropriate pharmaceutical form or vehicle.
  • the invention provides methods of use of compositions of formulas 1a, 1b and 2, for the treatment of cancer in a subject in need thereof, comprising the oral administration of therapeutically effective amounts of such compositions to such subject in an appropriate pharmaceutical form or vehicle.
  • the invention provides methods of use of compositions of formulas 1a, 1b and 2, for the treatment of tumor-specific immunosuppression associated with cancer, in a subject in need thereof, comprising the oral administration of sufficient amounts such compositions to such subject in an appropriate pharmaceutical form or vehicle.
  • the invention provides methods of use of compositions of formulas 1a, 1b and 2, to treat immunosuppression associated with infectious diseases (e.g HIV-1 infection, influenza), in a subject in need thereof, comprising the oral administration of sufficient amounts such compositions to such subject in an appropriate pharmaceutical form or vehicle.
  • infectious diseases e.g HIV-1 infection, influenza
  • a salt and/or a prodrug of indoximod is included in a pharmaceutical composition, and the composition is included in a solid capsule, gelatin capsule, tablet or pill. In one embodiment, the salt and/or the prodrug is included in a dissolvable capsule.
  • compositions of the present invention may additionally contain other adjunct components conventionally found in pharmaceutical compositions, at their art-established usage levels.
  • the compositions may contain additional materials useful in physically formulating various dosage forms of the compositions of the present invention, such as dyes, flavoring agents, preservatives, antioxidants, opacifiers, thickening agents and stabilizers.
  • the formulations can be sterilized and, if desired, mixed with auxiliary agents, e.g., lubricants, preservatives, stabilizers, wetting agents, emulsifiers, salts for influencing osmotic pressure, buffers, colorings, flavorings and/or aromatic substances and the like which do not deleteriously interact with the oligonucleotide(s) of the formulation.
  • auxiliary agents e.g., lubricants, preservatives, stabilizers, wetting agents, emulsifiers, salts for influencing osmotic pressure, buffers, colorings, flavorings and/or aromatic substances and the like which do not deleteriously interact with the oligonucleotide(s) of the formulation.
  • compositions of the present invention comprise one or more excipients.
  • excipients are selected from water, salt solutions, alcohol, polyethylene glycols, gelatin, lactose, lactose monohydrate, amylase, magnesium stearate, talc, silicic acid, viscous paraffin, hydroxymethylcellulose, microcrystalline cellulose and polyvinylpyrrolidone.
  • a pharmaceutical composition of the present invention is prepared using known techniques, including, but not limited to mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping or tableting processes.
  • a pharmaceutical composition of the present invention is a liquid (e.g., a suspension, elixir and/or solution).
  • a liquid pharmaceutical composition is prepared using ingredients known in the art, including, but not limited to, water, glycols, oils, alcohols, flavoring agents, preservatives, and coloring agents.
  • a pharmaceutical composition of the present invention is a solid (e.g., a powder, tablet, and/or capsule).
  • a solid pharmaceutical composition comprising one or more ingredients known in the art, including, but not limited to, starches, sugars, diluents, granulating agents, lubricants, binders, and disintegrating agents.
  • a pharmaceutical composition of the present invention comprises a delivery system.
  • delivery systems include, but are not limited to, liposomes and emulsions.
  • Certain delivery systems are useful for preparing certain pharmaceutical compositions including those comprising hydrophobic compounds.
  • certain organic solvents such as dimethylsulfoxide are used.
  • a pharmaceutical composition of the present invention comprises a co-solvent system.
  • co-solvent systems comprise, for example, benzyl alcohol, a nonpolar surfactant, a water-miscible organic polymer, and an aqueous phase.
  • co-solvent systems are used for hydrophobic compounds.
  • a non-limiting example of such a co-solvent system is the VPD co-solvent system, which is a solution of absolute ethanol comprising 3% w/v benzyl alcohol, 8% w/v of the nonpolar surfactant Polysorbate 80 and 65% w/v polyethylene glycol 300.
  • the proportions of such co-solvent systems may be varied considerably without significantly altering their solubility and toxicity characteristics.
  • co-solvent components may be varied: for example, other surfactants may be used instead of Polysorbate 80; the fraction size of polyethylene glycol may be varied; other biocompatible polymers may replace polyethylene glycol, e.g., polyvinyl pyrrolidone; and other sugars or polysaccharides may substitute for dextrose.
  • a pharmaceutical composition of the present invention comprises a sustained-release system.
  • a sustained-release system is a semi-permeable matrix of solid hydrophobic polymers.
  • sustained-release systems may, depending on their chemical nature, release pharmaceutical agents over a period of hours, days, weeks or months.
  • a pharmaceutical composition of the present invention is prepared for oral administration.
  • a pharmaceutical composition is formulated by combining one or more agents and pharmaceutically acceptable carriers.
  • Certain of such carriers enable pharmaceutical compositions to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions and the like, for oral ingestion by a subject
  • suitable excipients include, but are not limited to, fillers, such as sugars, including lactose, lactose monohydrate, sucrose, mannitol, or sorbitol; cellulose preparations such as, for example, maize starch, wheat starch, rice starch, potato starch, gelatin, gum tragacanth, methyl cellulose, hydroxypropylmethyl-cellulose, sodium carboxymethylcellulose, microcrystalline cellulose, and/or polyvinylpyrrolidone (PVP).
  • fillers such as sugars, including lactose, lactose monohydrate, sucrose, mannitol, or
  • such a mixture is optionally ground and auxiliaries are optionally added.
  • pharmaceutical compositions are formed to obtain tablets or dragee cores.
  • disintegrating agents e.g., cross-linked carboxymethyl cellulose, such as croscarmellose sodium, cross-linked polyvinyl pyrrolidone, agar, or alginic acid or a salt thereof, such as sodium alginate
  • cross-linked carboxymethyl cellulose such as croscarmellose sodium
  • polyvinyl pyrrolidone cross-linked polyvinyl pyrrolidone
  • agar such as a agar
  • dragee cores are provided with coatings.
  • concentrated sugar solutions may be used, which may optionally contain gum arabic, talc, polyvinyl pyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures.
  • Dyestuffs or pigments may be added to tablets or dragee coatings.
  • compositions for oral administration are push-fit capsules made of gelatin.
  • Certain of such push-fit capsules comprise one or more pharmaceutical agents of the present invention in admixture with one or more filler such as lactose, binders such as starches, and/or lubricants such as talc or magnesium stearate and, optionally, stabilizers.
  • pharmaceutical compositions for oral administration are soft, sealed capsules made of gelatin and a plasticizer, such as glycerol or sorbitol.
  • one or more pharmaceutical agents of the present invention are be dissolved or suspended in suitable liquids, such as fatty oils, liquid paraffin, or liquid polyethylene glycols.
  • stabilizers may be added.
  • compositions are prepared for buccal administration. Certain of such pharmaceutical compositions are tablets or lozenges formulated in conventional manner.
  • a pharmaceutical composition is prepared for administration by injection (e.g., intravenous, subcutaneous, intramuscular, etc.).
  • a pharmaceutical composition comprises a carrier and is formulated in aqueous solution, such as water or physiologically compatible buffers such as Hanks's solution, Ringer's solution, or physiological saline buffer.
  • other ingredients are included (e.g., ingredients that aid in solubility or serve as preservatives).
  • injectable suspensions are prepared using appropriate liquid carriers, suspending agents and the like.
  • compositions for injection are suspensions, solutions or emulsions in oily or aqueous vehicles, and may contain formulatory agents such as suspending, stabilizing and/or dispersing agents.
  • Certain solvents suitable for use in pharmaceutical compositions for injection include, but are not limited to, lipophilic solvents and fatty oils, such as sesame oil, synthetic fatty acid esters, such as ethyl oleate or triglycerides, and liposomes.
  • Aqueous injection suspensions may contain substances that increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran.
  • such suspensions may also contain suitable stabilizers or agents that increase the solubility of the pharmaceutical agents to allow for the preparation of highly concentrated solutions.
  • a pharmaceutical composition of the present invention may be an effervescent tablet or granulate.
  • Effervescent tablets most commonly consist of a soluble acid source and a carbonate source to produce carbon dioxide gas, the latter serving as disintegrant.
  • the acidity needed for the effervescent reaction can be derived from food acids, acid anhydrides and acid salts.
  • the food acid can for example be citric acid, tartaric acid, malic acid, fumaric acid, adipic acid or succinic acid.
  • the acid anhydride may be succinic anhydride or citric anhydride or the like.
  • the acid salts may be e.g.
  • Suitable carbonate sources are for example sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, sodium sesquicarbonate (mixture of equal molar amounts of sodium carbonate and sodium bicarbonate), glycine carbonate, L-lysine carbonate, arginine carbonate, calcium carbonate.
  • Effervescence may also be induced by the formation of other gases such as oxygen, e.g. released from sodium perborate or from a combination of e.g. a peroxygen compound that yields active oxygen on mixture with water (e.g. sodium perborate monohydrate or sodium percarbonate) and a chlorine compound that liberates hypochlorite on contact with water (e.g. sodium dichloroisocyanurate or calcium hypochlorite).
  • oxygen e.g. released from sodium perborate or from a combination of e.g. a peroxygen compound that yields active oxygen on mixture with water (e.g. sodium perborate monohydrate or sodium percarbonate) and a chlorine compound that liberates hypochlorite on contact with water (e.g. sodium dichloroisocyanurate or calcium hypochlorite).
  • oxygen e.g. released from sodium perborate or from a combination of e.g. a peroxygen compound that yields active oxygen on mixture with water (e.g. sodium
  • the pharmaceutical composition of the present invention can be manufactured according to standard methods known in the art.
  • Granulates and effervescent tablets according to the invention can be obtained by dry compaction or wet granulation. These granulates can subsequently be mixed with e.g. suitable disintegrating agents, glidants and lubricants and be compressed into tablets or filled into e.g. sachets of suitable size.
  • Effervescent tablets can also be obtained by direct compression of a suitable powder mixture, i.e. without any preceding granulation of the excipients.
  • Suitable powder or granulate mixtures according to the invention are also obtainable by spray drying (e.g., by hot process spray drying or by basic spray drying) , lyophilization, melt extrusion, pellet layering, coating of the active pharmaceutical ingredient or any other suitable method.
  • spray drying e.g., by hot process spray drying or by basic spray drying
  • lyophilization e.g., melt extrusion, pellet layering, coating of the active pharmaceutical ingredient or any other suitable method.
  • the conditions are chosen such as to prevent amorphization of the active pharmaceutical ingredient
  • the so obtained powders or granulates can be mixed with one or more suitable ingredients and the resulting mixtures can either be compressed to form effervescent tablets or filled into sachets.
  • alkyl group can be both a monovalent radical or divalent radical; in the latter case, it would be apparent to one skilled in the art that an additional hydrogen atom is removed from a monovalent alkyl radical to provide a suitable divalent moiety.
  • alkenyl as used herein, means a straight or branched chain hydrocarbon containing from 2 to 10 carbons, unless otherwise specified, and containing at least one carbon carbon double bond.
  • Representative examples of alkenyl include, but are not limited to, ethenyl, 2-propenyl, 2-methyl-2-propenyl, 3-butenyl, 4-pentenyl, 5-hexenyl, 2-heptenyl, 2-methyl-1-heptenyl, 3-decenyl, and 3,7-dimethylocta 2,6-dienyl.
  • alkoxy as used herein, means an alkyl group, as defined herein, appended to the parent molecular moiety through an oxygen atom.
  • Representative examples of alkoxy include, but are not limited to, methoxy, ethoxy, propoxy, 2-propoxy, butoxy, tert butoxy, pentyloxy, and hexyloxy.
  • alkyl as used herein, means a straight or branched chain hydrocarbon containing from 1 to 10 carbon atoms, unless otherwise specified.
  • Representative examples of alkyl include, but are not limited to, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, 3-methylhexyl, 2,2-dimethylpentyl, 2,3-dimethylpentyl, n-heptyl, n-octyl, n-nonyl, and n-decyl.
  • an “alkyl” group is a linking group between two other moieties, then it may also be a straight or branched chain; examples include, but are not limited to -CH 2 -, -CH 2 CH 2 -, -CH 2 CH 2 CHC(CH 3 )-, -CH 2 CH(CH 2 CH 3 )CH 2 -.
  • C 1-5 alkyl refers to a linear or branched alkyl of 1 to 5 carbon atoms.
  • C 1-6 alkyl refers to a linear or branched alkyl of 1 to 6 carbon atoms.
  • aryl means a phenyl (i.e., monocyclic aryl), or a bicyclic ring system containing at least one phenyl ring or an aromatic bicyclic ring containing only carbon atoms in the aromatic bicyclic ring system.
  • the bicyclic aryl can be azulenyl, naphthyl, or a phenyl fused to a monocyclic cycloalkyl, a monocyclic cycloalkenyl, or a monocyclic heterocyclyl.
  • the bicyclic aryl is attached to the parent molecular moiety through any carbon atom contained within the phenyl portion of the bicyclic system, or any carbon atom with the napthyl or azulenyl ring.
  • the fused monocyclic cycloalkyl or monocyclic heterocyclyl portions of the bicyclic aryl are optionally substituted with one or two oxo and/or thia groups.
  • bicyclic aryls include, but are not limited to, azulenyl, naphthyl, dihydroinden-1-yl, dihydroinden-2-yl, dihydroinden-3-yl, dihydroinden-4-yl, 2,3-dihydroindol-4-yl, 2,3-dihydroindol-5-yl, 2,3-dihydroindol-6-yl, 2,3-dihydroindol-7-yl, inden-1-yl, inden-2-yl, inden-3-yl, inden-4-yl, dihydronaphthalen-2-yl, dihydronaphthalen-3-yl, dihydronaphtlialen-4-yl, dihydronaphthalen-1-yl, 5,6,7,8-tetrahydronaphthalen-1-yl, 5,6,7,8-tetrahydronaphthalen-2-yl, 2,3-
  • the bicyclic aryl is (i) naphthyl or (ii) a phenyl ring fused to either a 5 or 6 membered monocyclic cycloalkyl, a 5 or 6 membered monocyclic cycloalkenyl, or a 5 or 6 membered monocyclic heterocyclyl, wherein the fused cycloalkyl, cycloalkenyl, and heterocyclyl groups are optionally substituted with one or two groups which are independently oxo or thia.
  • arylalkyl means an aryl group, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
  • Representative examples of arylalkyl include, but are not limited to, benzyl, 2-phenylethyl, 3-phenylpropyl, and 2-naphth-2-ylethyl.
  • cyano and "nitrile” as used herein, mean a -CN group.
  • cycloalkyl as used herein, means a monocyclic or a bicyclic cycloalkyl ring system.
  • Monocyclic ring systems are cyclic hydrocarbon groups containing from 3 to 8 carbon atoms, where such groups can be saturated or unsaturated, but not aromatic. In certain embodiments, cycloalkyl groups are fully saturated. Examples of monocyclic cycloalkyls include cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, cyclohexenyl, cycloheptyl, and cyclooctyl.
  • Bicyclic cycloalkyl ring systems are bridged monocyclic rings or fused bicyclic rings.
  • Bridged monocyclic rings contain a monocyclic cycloalkyl ring where two non adjacent carbon atoms of the monocyclic ring are linked by an alkylene bridge of between one and three additional carbon atoms (i.e., a bridging group of the form -(CH 2 ) w -, where w is 1, 2, or 3).
  • bicyclic ring systems include, but are not limited to, bicyclo[3.1.1]heptane, bicyclo[2.2.1]heptane, bicyclo[2.2.2]octane, bicyclo[3.2.2]nonane, bicyclo[3.3.1]nonane, and bicyclo[4.2.1]nonane.
  • Fused bicyclic cycloalkyl ring systems contain a monocyclic cycloalkyl ring fused to either a phenyl, a monocyclic cycloalkyl, a monocyclic cycloalkenyl, a monocyclic heterocyclyl, or a monocyclic heteroaryl.
  • the bridged or fused bicyclic cycloalkyl is attached to the parent molecular moiety through any carbon atom contained within the monocyclic cycloalkyl ring.
  • Cycloalkyl groups are optionally substituted with one or two groups which are independently oxo or thia.
  • the fused bicyclic cycloalkyl is a 5 or 6 membered monocyclic cycloalkyl ring fused to either a phenyl ring, a 5 or 6 membered monocyclic cycloalkyl, a 5 or 6 membered monocyclic cycloalkenyl, a 5 or 6 membered monocyclic heterocyclyl, or a 5 or 6 membered monocyclic heteroaryl, wherein the fused bicyclic cycloalkyl is optionally substituted by one or two groups which are independently oxo or thia.
  • Cycloalkenyl refers to a monocyclic or a bicyclic cycloalkenyl ring system.
  • Monocyclic ring systems are cyclic hydrocarbon groups containing from 3 to 8 carbon atoms, where such groups are unsaturated (i.e., containing at least one annular carbon carbon double bond), but not aromatic. Examples of monocyclic ring systems include cyclopentenyl and cyclohexenyl.
  • Bicyclic cycloalkenyl rings are bridged monocyclic rings or a fused bicyclic rings.
  • Bridged monocyclic rings contain a monocyclic cycloalkenyl ring where two non adjacent carbon atoms of the monocyclic ring are linked by an alkylene bridge of between one and three additional carbon atoms (i.e., a bridging group of the form -(CH 2 ) w -, where w is 1, 2, or 3).
  • alkylene bridge of between one and three additional carbon atoms
  • bicyclic cycloalkenyls include, but are not limited to, norbornenyl and bicyclo[2.2.2]oct-2-enyl.
  • Fused bicyclic cycloalkenyl ring systems contain a monocyclic cycloalkenyl ring fused to either a phenyl, a monocyclic cycloalkyl, a monocyclic cycloalkenyl, a monocyclic heterocyclyl, or a monocyclic heteroaryl.
  • the bridged or fused bicyclic cycloalkenyl is attached to the parent molecular moiety through any carbon atom contained within the monocyclic cycloalkenyl ring.
  • Cycloalkenyl groups are optionally substituted with one or two groups which are independently oxo or thia.
  • halo or halogen as used herein, means Cl, Br, I or F.
  • haloalkyl as used herein, means at least one halogen, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
  • Representative examples of haloalkyl include, but are not limited to, chloromethyl, 2-fluoroethyl, trifluoromethyl, pentafluoroethyl, and 2-chloro-3-fluoropentyl.
  • heteroaryl means a monocyclic heteroaryl or a bicyclic ring system containing at least one heteroaromatic ring.
  • the monocyclic heteroaryl can be a 5 or 6 membered ring.
  • the 5 membered ring consists of two double bonds and one, two, three or four nitrogen atoms and optionally one oxygen or sulfur atom.
  • the 6 membered ring consists of three double bonds and one, two, three or four nitrogen atoms.
  • the 5 or 6 membered heteroaryl is connected to the parent molecular moiety through any carbon atom or any nitrogen atom contained within the heteroaryl.
  • monocyclic heteroaryl include, but are not limited to, furyl, imidazolyl, indolyl, 1-methyl-indolyl, isoxazolyl, isothiazolyl, oxadiazolyl, oxazolyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl, pyrazolyl, pyrrolyl, tetrazolyl, thiadiazolyl, thiazolyl, thienyl, triazolyl, and triazinyl.
  • the bicyclic heteroaryl consists of a monocyclic heteroaryl fused to a phenyl, a monocyclic cycloalkyl, a monocyclic cycloalkenyl, a monocyclic heterocyclyl, or a monocyclic heteroaryl.
  • the fused cycloalkyl or heterocyclyl portion of the bicyclic heteroaryl group is optionally substituted with one or two groups which are independently oxo or thia.
  • the bicyclic heteroaryl contains a fused cycloalkyl, cycloalkenyl, or heterocyclyl ring
  • the bicyclic heteroaryl group is connected to the parent molecular moiety through any carbon or nitrogen atom contained within the monocyclic heteroaryl portion of the bicyclic ring system.
  • the bicyclic heteroaryl is a monocyclic heteroaryl fused to a phenyl ring or a monocyclic heteroaryl, then the bicyclic heteroaryl group is connected to the parent molecular moiety through any carbon atom or nitrogen atom within the bicyclic ring system.
  • bicyclic heteroaryl include, but are not limited to, benzimidazolyl, benzofuranyl, benzothienyl, benzoxadiazolyl, benzoxathiadiazolyl, benzothiazolyl, cinnolinyl, 5,6-dihydroquinolin-2-yl, 5,6-dihydroisoquinolin-1-yl, furopyridinyl, indazolyl, indolyl, isoquinolinyl, naphthyridinyl, quinolinyl, purinyl, 5,6,7,8-tetrahydroquinolin-2-yl, 5,6,7,8-tetrahydroquinolin-3-yl, 5,6,7,8-tetrahydroquinolin-4-yl, 5,6,7,8-tetrahydroisoquinolin-1-yl, thienopyridinyl, 4,5,6,7-tetrahydrobenzo[c]
  • the fused bicyclic heteroaryl is a 5 or 6 membered monocyclic heteroaryl ring fused to either a phenyl ring, a 5 or 6 membered monocyclic cycloalkyl, a 5 or 6 membered monocyclic cycloalkenyl, a 5 or 6 membered monocyclic heterocyclyl, or a 5 or 6 membered monocyclic heteroaryl, wherein the fused cycloalkyl, cycloalkenyl, and heterocyclyl groups are optionally substituted with one or two groups which are independently oxo or thia.
  • heteroarylalkyl and " alkylheteroaryl” as used herein, means a heteroaryl, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
  • Representative examples of heteroarylalkyl include, but are not limited to, fur-3-ylmethyl, 1H-imidazol-2-ylmethyl, 1H-imidazol-4-ylmethyl, 1-(pyridine-4-yl)ethyl, pyridine-3-ylmethyl, pyridine-4-ylmethyl, pyrimidin-5-ylmethyl, 2-(pyrimidin-2-yl)propyl, thien-2-ylmethyl, and thien-3-ylmethyl.
  • heterocyclyl or “heterocycloalkyl” as used herein, means a monocyclic heterocycle or a bicyclic heterocycle.
  • the monocyclic heterocycle is a 3, 4, 5, 6 or 7 membered ring containing at least one heteroatom independently selected from the group consisting of O, N, and S where the ring is saturated or unsaturated, but not aromatic.
  • the 3 or 4 membered ring contains 1 heteroatom selected from the group consisting of O, N and S.
  • the 5 membered ring can contain zero or one double bond and one, two or three heteroatoms selected from the group consisting of O, N and S.
  • the 6 or 7 membered ring contains zero, one or two double bonds and one, two or three heteroatoms selected from the group consisting of O, N and S.
  • the monocyclic heterocycle is connected to the parent molecular moiety through any carbon atom or any nitrogen atom contained within the monocyclic heterocycle.
  • monocyclic heterocycle include, but are not limited to, azetidinyl, azepanyl, aziridinyl, diazepanyl, 1,3-dioxanyl, 1,3-dioxolanyl, 1,3-dithiolanyl, 1,3-dithianyl, imidazolinyl, imidazolidinyl, isothiazolinyl, isothiazolidinyl, isoxazolinyl, isoxazolidinyl, morpholinyl, oxadiazolinyl, oxadiazolidinyl, oxazolinyl, oxazolidinyl, piperazinyl, piperidinyl, pyranyl, pyrazolinyl, pyrazolidinyl, pyrrolinyl, pyrrolidinyl, tetrahydrofuranyl, tetrahydrothienyl, thiadiazol
  • the bicyclic heterocycle is a monocyclic heterocycle fused to either a phenyl, a monocyclic cycloalkyl, a monocyclic cycloalkenyl, a monocyclic heterocycle, or a monocyclic heteroaryl.
  • the bicyclic heterocycle is connected to the parent molecular moiety through any carbon atom or any nitrogen atom contained within the monocyclic heterocycle portion of the bicyclic ring system.
  • bicyclic heterocyclyls include, but are not limited to, 2,3-dihydrobenzofuran-2-yl, 2,3-dihydrobenzofuran-3-yl, indolin-1-yl, indolin-2-yl, indolin-3-yl, 2,3-dihydrobenzothien-2-yl, decahydroquinolinyl, decahydroisoquinolinyl, octahydro-1H-indolyl, and octahydrobenzofuranyl.
  • Heterocyclyl groups are optionally substituted with one or two groups which are independently oxo or thia.
  • the bicyclic heterocyclyl is a 5 or 6 membered monocyclic heterocyclyl ring fused to phenyl ring, a 5 or 6 membered monocyclic cycloalkyl, a 5 or 6 membered monocyclic cycloalkenyl, a 5 or 6 membered monocyclic heterocyclyl, or a 5 or 6 membered monocyclic heteroaryl, wherein the bicyclic heterocyclyl is optionally substituted by one or two groups which are independently oxo or thia.
  • hydroxy as used herein, means an -OH group.
  • nitro as used herein, means a -NO 2 group.
  • thia as used herein means a -S- group.
  • saturated means the referenced chemical structure does not contain any multiple carbon-carbon bonds.
  • a saturated cycloalkyl group as defined herein includes cyclohexyl, cyclopropyl, and the like.
  • unsaturated means the referenced chemical structure contains at least one multiple carbon carbon bond, but is not aromatic.
  • a unsaturated cycloalkyl group as defined herein includes cyclohexenyl, cyclopentenyl, cyclohexadienyl, and the like.
  • the term "individual” or “patient,” used interchangeably, refers to any animal, including mammals, preferably mice, rats, other rodents, rabbits, dogs, cats, swine, cattle, sheep, horses, or primates, and most preferably humans.
  • the phrase "therapeutically effective amount” refers to the amount of active compound or pharmaceutical agent that elicits the biological or medicinal response that is being sought in a tissue, system, animal, individual or human by a researcher, veterinarian, medical doctor or other clinician.
  • a therapeutically effective amount can be an amount suitable for a patient.
  • treatment means (i) ameliorating the referenced disease state, for example, ameliorating a disease, condition or disorder in an individual who is experiencing or displaying the pathology or symptomatology of the disease, condition or disorder (i.e., reversing or improving the pathology and/or symptomatology) such as decreasing the severity of disease; or (ii) eliciting the referenced biological effect (e.g., IDO modulation or tryptophan degradation inhibition).
  • ameliorating the referenced disease state for example, ameliorating a disease, condition or disorder in an individual who is experiencing or displaying the pathology or symptomatology of the disease, condition or disorder (i.e., reversing or improving the pathology and/or symptomatology) such as decreasing the severity of disease; or (ii) eliciting the referenced biological effect (e.g., IDO modulation or tryptophan degradation inhibition).
  • Manifestation of amelioration of a disease condition with underlying IDO-mediated immunosuppression may require the concomitant or sequential administration of additional therapeutic agents, such as antineoplastic agents in the case of cancer, or antiretroviral agents in the case of viral diseases.
  • additional therapeutic agents such as antineoplastic agents in the case of cancer, or antiretroviral agents in the case of viral diseases.
  • administration of IDO inhibitors for the treatment of cancer does not always produce a direct antitumor effect when used as a single agent
  • chemotherapeutic drugs antagonistineoplastic
  • the antitumor effect observed is higher than the sum of effects of each agent alone.
  • catalytic pocket As used herein, the terms “catalytic pocket”, “catalytic site”, “active site” collectively and indistinctly refer to a region of the enzyme that contains amino acid residues responsible for the substrate binding (charge, hydrophobicity, steric hindrance) and catalytic amino acid residues which act as proton donors or acceptors or are responsible for binding a cofactor and participate in the catalysis of a chemical reaction.
  • pharmaceutically acceptable salt refers to both pharmaceutically acceptable acid and base addition salts and solvates.
  • Such pharmaceutically acceptable salts include salts of acids such as hydrochloric, phosphoric, hydrobromic, sulfuric, sulfinic, formic, toluenesulfonic, methanesulfonic, nitric, benzoic, citric, tartaric, maleic, hydroiodic, alkanoic such as acetic, HOOC-(CH 2 )n-COOH where n is 0-4, and the like.
  • Nontoxic pharmaceutical base addition salts include salts of bases such as sodium, potassium, calcium, ammonium, and the like. Those skilled in the art will recognize a wide variety of nontoxic pharmaceutically acceptable addition salts.
  • indoximod refers to 1-methyl-D-tryptophan, also referred to as D-1MT or D1mT.
  • prodrug of indoximod refers to any substance that after in vivo administration is metabolized to produce indoximod as one of the main metabolites.
  • 1 H NMR spectra were obtained with a Bruker DRX400, Varian VXR400 or VXR300. 1 H NMR spectra were reported in parts per million ( ⁇ ) relative to TMS (0.0), DMSO-d 6 (2.50) or CD 3 OD (4.80) as an internal reference. All 1 H NMR spectra were taken in CDCl 3 unless otherwise indicated.
  • NLG-1558 free base (0.750 mg, 2.57 mmol) in acetonitrile (10 mL) at 0 °C was added Boc 2 O (560 mg, 2.57 mmol) and the reaction was allowed to warm to RT and stirred for 4 h. The solvent was removed under reduced pressure and the crude was purified by column chromatography to afford the desired product (760 mg, 75%).
  • the purity was 99.7% area based on the HPLC analysis, and the stoichiometry was analyzed by ELSD, the calculated molar ratio (API:HCl acid) were 1:1.0.
  • the powder was crystalline as assessed by polarized light microscopy (PLM) and by X-ray powder dispersion spectrometry (XRPD, Figure 1 ).
  • the salt was anhydrous as assessed by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) ( Figure 2 ).
  • NLG-1668 (S)-6-(((R)-1-carboxy-2-(1-methyl-1H-indol-3-yl)ethyl)amino)-6-oxohexane-1,5 diaminium methanesulfonate 79
  • D-1MT (HPLC purity 99.6%) free base is a white powder and it displays birefringence, needle shape and crystalline appearance under the polarized light microscope (PLM) and by X-ray powder dispersion spectroscopy (XRPD) ( Figure 1 ). It only shows single melt endothermic peak with onset at 293.8°C by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) and ⁇ 0.01% weight loss from 30-200°C, indicating that is an anhydrate form. This crystalline form is non-hygroscopic (0.09% weight gain from 0-80 %RH), and does not show changes after dynamic vapor sorption method (DVS).
  • TGA thermogravimetric analysis
  • DSC differential scanning calorimetry
  • indoximod salt tested was the maleic acid salt, which showed low melting point of 194°C and poor crystallinity by PLM and XRPD. This salt has the appearance of a sticky white powder of hydrate or solvate form (4.5% weight loss by TGA).
  • the tosylate salt shows the appearance of a brown oil, which may be advantageous as that could increase the intestinal absorption of the active ingredient
  • Example 4 Sprayed dry dispersions of indoximod
  • SDD indoximod sprayed dry dispersion
  • C maxGB represented the maximum concentration of indoximod in solution when enough of the SDD formulation was dissolved in GB for 30 min
  • C max90 represents the maximum indoximod concentration when the SDD was dissolved in SIF for 90 min
  • UltraC 90 represents the concentration in SIF after 90 min of dissolution followed by ultracentrifugation to remove any particulates
  • UltraC 1200 represents the concentration in SIF after 1200 min of dissolution followed by ultracentrifugation to remove any particulates. It was expected that the enhanced concentrations of indoximod in GB and SIF increased the absorption of indoximod when the SDD formulation was dosed in animals as well as human beings.
  • SDD formulations made by hot process spray drug method were in general more stable than those made by basic process spray dry.
  • higher drug load in the powder was preferred since it could decrease the dose amount of the final formulation. Based on all these criteria, two SDD formulations were selected for further in vivo PK studies in monkeys.
  • the first one was 50% indoximod/ 50% PVPVA-64, which showed a 1.8-fold increased predicted intestinal concentration than indoximod (UltraC 90 3293 ng/mL vs 1849 ng/mL); and the second was 50% indoximod/ 50% Affinisol 126, which showed a 2.3-fold higher predicted intestinal concentration than indoximod (UltraC 90 4340 ng/mL vs 1849 ng/mL).
  • SDDs were prepared by the hot process dry spray which showed better stability properties.
  • Table 3 Dissolution tests for sprayed dry dispersion formulations of indoximod Composition Process Method C maxGB ( ⁇ g/ML) C max90 ( ⁇ g/mL) UltraC 90 ( ⁇ g/mL) UltraC 1200 ( ⁇ g/mL) Indoximod API (control) NA 5,154 2,213 1,849 1,854 10% Indoximod/ 90% Affinisol 126 hot process spray dry 6,253 3,027 2,982 3,392 25% Indoximod/ 75% Affinisol 126 basic spray dry 7,466 4,064 3,023 3,096 25% Indoximod/ 75% HPMC-E3 basic spray dry 17,281 7,313 3,943 3,171 25% Indoximod/ 75% PVPVA-64 basic spray dry 20,116 9,349 2,531 2,908 25% Indoximod/ 75% Affinisol 126 hot process spray dry 6,831 3,932 3,892 3,976 25% Indoximod/ 75% Eudragit L100 hot process spray dry 4,015 2,487 2,494
  • Example 5 Pharmacokinetic comparison of indoximod free base, indoximod salts and indoximod SDD in cynomolgus monkeys
  • indoximod in SDD formulation animals in Group 1 were dosed with 4 mL/kg of a 15 mg indoximod/mL suspension and animals in Group 2 were dosed with 4 mL/kg of a 45 mg indoximod/mL suspension.
  • the SDD suspension formulations were prepared in 0.5% methylcellulose (Methocel).
  • Table 4 Composition of capsules containing indoximod in its free base or salt forms for oral dosing to cynomolgus monkeys Indoximod Free Base Indoximod HCl Indoximod 0.5 PO 4 H 3 MW (g/mol) 218.26 254.76 267.3
  • Ingredients (mg) Cap A Cap B Cap A Cap B Cap A Cap B Active Ingredient (mg) 100 225 116.7 262.5 122.4 275.5 Avicel PH101 (mg) 17.9 40.2 20.8 46.9 21.9 49.2 Mannitol (mg) 17.9 40.2 20.8 46.9 21.9 49.2 Croscarmellose Sodium (mg) 7.1 16.1 8.3 18.8 8.7 19.7 Total 142.9 321.4 166.7 375 174.9 393.6
  • indoximod in SDD1 or SDD2 formulation produced a significant increase in Cmax (15-94%) but failed to increase the overall exposure with respect to indoximod free base capsules.
  • indoximod salts in their hydrocholoride, hemi-phosphate or phosphate salts are preferred over indoximod in its free base form, either in capsules or in spray dry dispersions.
  • Gelatin capsules (Torpac, 20 mg capacity) were prepared containing 11.4, 28.6 or 50 ⁇ mol/capsule of indoximod or its salts, with or without excipients consisting of microcrystalline cellulose, lactose monohydrate, croscarmellose sodium and magnesium stearate, in proportions shown in Table 6.1-6.3. Capsules were manually filled and the composition uniformity of a representative sample of capsules from each batch was verified by weight and by LC-MS/MS to determine the average indoximod content.
  • Table 6.1 Composition of capsules A containing indoximod in its free base or salt forms for oral dosing of rats at 37 ⁇ mol / kg indoximod Free Base indoximod HCl indoximod H 3 PO 4 indoximod H 2 SO 4 indoximod CH 3 SO 3 H MW (g/mol) 218.26 254.76 316.25 316.33 314.36 (mg) %(w/w) (mg) %(w/w) (mg) %(w/w) (mg) %(w/w) (mg) %(w/w) Active Ingredient 2.50 12.50 2.92 14.59 3.62 18.11 3.62 18.11 3.60 18.00 Microcrystalline Cellulose 7.45 37.25 7.3 36.50 7.1 35.50 7.1 35.49 7.1 35.50 Lactose Monohydrate 7.45 37.25 7.3 36.50 7.1 35.50 7.1 35.49 7.1 35.50 CroscarmelloseSodium 2.4 12.00 2.28 11.40 1.98
  • rats were dosed by intra-stomach delivery with 1 capsule A, 2 capsules B or 3 capsules C to achieve dose levels of 37, 185 and 500 ⁇ mol/kg (equivalent to 8, 40 and 110 mg/kg of indoximod, respectively). Rats were fasted 16h prior to dosing to eliminate any confounding food effects, and food was returned 2h after dosing. Blood samples were obtained from each rat at 0, 15 min, 30 min, 1h, 2h, 4h, 6h, 10h, 24h, 48h and 72h after dosing. The concentration of indoximod in plasma was determined by LC-MS/MS, and pharmacokinetic parameters were calculated using the software WinNonLin (Certara).
  • Indoximod hydrochloride salt form results in non-statistically significant decrease in Cmax at low dose level, a statistically significant increase at the intermediate dose and a statistically significant decrease at high level.
  • the drug exposure (AUC) for the hydrochloride salt did not show a significant change at the low and high dose level but showed a significant increase at the intermediate level.
  • the different behavior of indoximod hydrochloride in rodents compared to primates is unexpected based on the solubility and dissolution profile of this salt, and it does not follow a dose dependent trend, which highlights the importance of conducting species-specific and dose-dependent tests for the prediction of pharmacokinetic profiles in humans.
  • Indoximod phosphate and hemiphosphate showed a significant increase in Cmax and AUC at the low and intermediate dose levels but a significant decrease in Cmax and a non-statistically significant decrease in exposure at the highest dose level.
  • the dose-dependent correlation for Cmax and AUC for the free base, HCl and PO 4 H 3 forms of indoximod is shown in Figure 6 .
  • This figure shows an increase in Cmax for the HCl and PO 4 H 3 salts with respect to the free base at the low and intermediate dose levels but a saturation in the Cmax dose-response curve at the highest dose level, which is not seen for the free base.
  • the dose-response curve for AUC shows a more linear increase of AUC with dose, except for the PO 4 H 3 salt which seems to increase less than dose proportional at the highest dose level tested.
  • indoximod such as sulfate or mesylate increase the Cmax and AUC ⁇ 30-40% when tested at 37 ⁇ mol/kg.
  • indoximod obtained after oral administration of several indoximod prodrugs was tested in such a way that reflected only differences in intestinal permeability and conversion of prodrug to indoximod in vivo without reflecting differences in solid state form such as differences in polymorphic crystals or amorphous solids which may impact solubility or solubilization rate for the different prodrugs. Therefore, indoximod and each of its prodrugs was solubilized in appropriate vehicle which was either saline solution, Cremaphor ® :ethanol:saline (10:10:80), or Chremaphor:EtOH:saline:HCl (10:10:80:0.1N).
  • Indoximod or its prodrugs were dissolved at a concentration of 1 mg/mL and dosed to rats by oral gavage at 10 mL/kg to achieve a final dose of 10 mg/kg; or dissolved at 25 mg/mL and dosed to rats by oral gavage at 2 mL/kg to achieve a final dose of 50 mg/kg; or dissolved at a concentration of 10 mg/mL and dosed orally to mice by oral gavage at 5 mL/kg to achieve a final dose of 50 mg/kg.
  • Blood samples (0.1-0.2 mL) were collected from the femoral artery port from rats or by retro-orbital bleeding from mice and plasma was immediately collected by centrifugation and stored on dry ice to avoid prodrug hydrolysis after plasma collection.
  • Tables 8.1 and 8.2 show the indoximod Cmax and AUC( 0-> ⁇ ) obtained after dosing either indoximod or each one of the test prodrugs. Since all rats were orally dosed at the same dose of 10 mg/kg, but each prodrug has different molecular weight, in order to compare the values of Cmax and AUC( 0-> ⁇ ) obtained after dosing each prodrug vs. dosing indoximod as a free base, the measured Cmax and AUC( 0-> ⁇ ) and were normalized by multiplying them by the ratio of MW Prodrug /MWi ndoximod, thus assuming linear pharmacokinetics within a ⁇ 2-fold dose range.
  • Table 8.1 shows that some prodrugs result in an effective increase in either Cmax, AUC or both pharmacokinetic parameters. Since the prodrugs were administered in completely soluble form, this suggests that those prodrugs that show enhanced Cmax and/or AUC of indoximod in plasma do so by a mechanism that involves a combination of factors including enhanced permeability of the prodrug through the intestinal cell wall, reduced clearance of the prodrug with respect to indoximod and good rate of conversion of the prodrug to indoximod in vivo. Not every prodrug form of indoximod resulted in enhanced maximum concentration and exposure of indoximod compared to administration of indoximod.
  • Table 8.2 shows prodrugs that did not result in an effective increase in indoximod Cmax nor indoximod exposure when dosed orally to rats at 10 mg/kg, indicating that some of these chemical substitutions may either decrease permeability, or the rate of conversion to indoximod or increase the rate of prodrug clearance by routes that do not result in conversion to indoximod, or a combination of those effects.
  • NLG-1283 causes an increase in Cmax and AUC when dosed to rats at 50 mg/kg.
  • this prodrug results in a decrease in Cmax and AUC when dosed to mice at 50 mg/kg.
  • the highly similar molecule NLG-1284 does not produce a significant increase in Cmax or AUC when dosed at 50 mg/kg to rats, but it does produce a significant increase in Cmax and AUC in mice, suggesting that different species have different rates of absorption, elimination and metabolization of these prodrugs and that minimal changes in molecular structure can affect the outcome in different species.
  • mice which were dosed at 10, 50 and 100 mg/kg of indoximod, or at similar doses for prodrug NLG-1626 or NLG-1665.
  • a caveat of the comparison between dosing prodrugs vs indoximod as a free base was that prodrugs were fully soluble in the dosing formulation, while indoximod was insoluble at doses of 50 and 100 mg/kg. This may result in a time-dependent controlled release effect for indoximod which could result in lower Cmax but higher AUCs than when dosed in fully soluble form.
  • NLG-1626 and NLG-1665 resulted in a significant increase in indoximod Cmax compared to what is observed when dosing indoximod in suspension, at all doses tested.
  • NLG-1626 showed a dose dependent increase AUC for indoximod, where the percentage of increase in AUC decreases at higher doses.
  • Table 8.3 also indicates that formation of carbamates on the amino group of indoximod result in prodrugs with marked reduction in pharmacokinetic parameters for indoximod.
  • Example 8 Pharmacokinetic testing of indoximod prodrug salts in solid capsule formulation in rats
  • prodrugs have the best combined set of pharmacological properties (solubilization rate, solubility, intestinal permeability, clearance rate and rate of metabolization to indoximod) needed to achieve greater plasma concentrations of indoximod and increased exposure to indoximod after oral dosing in a capsule formulation
  • the prodrugs that showed enhanced indoximod Cmax or exposure when dosed in solution were prepared in several salt forms and mixed with excipients to form a powder blend. These blends were formulated so that each capsule contained the same molar dose of each prodrug.
  • Gelatin capsules (Torpac, 20 mg capacity) were prepared containing 11 ⁇ mol/capsule A, 28 ⁇ mol/capsule B or 50 ⁇ mol/capsule C of indoximod free base (2.5, 6.3 or 11.4 mg/capsule, respectively) or its prodrugs in diverse salt forms, in an excipient blend consisting of microcrystalline cellulose, lactose monohydrate, croscarmellose sodium and magnesium stearate, in proportions shown in Tables 9.1a and 9.1b. The composition and uniformity of a representative sample of capsules from each batch was verified by weight and by LC-MS/MS to determine the average indoximod or prodrug content.
  • 1 capsule A 11 ⁇ mol/capsule
  • 2 capsules B 28 ⁇ mol/capsule
  • 3 capsules C 50 ⁇ mol/capsule
  • the dose levels tested were equivalent to 8 mg/kg (37 ⁇ mol/kg) of indoximod equivalent when dosing 1 capsule A of 11 ⁇ mol/capsule, 40 mg/kg (185 ⁇ mol/kg) of indoximod equivalent when dosing 2 capsules B of 28 ⁇ mol/capsule and 110 mg/kg (500 ⁇ mol/kg) of indoximod equivalent when dosing 3 capsules C of 50 ⁇ mol/capsule.
  • Rats were fasted 16h prior to dosing to eliminate any confounding food effects, and food was returned 2h after dosing. Blood samples were obtained from each rat at 0, 15 min, 30 min, 1h, 2h, 4h, 6h, 10h, 24h, 48h and 72h after dosing. The concentration of indoximod in plasma was determined by LC-MS/MS, and pharmacokinetic parameters were calculated using the software WinNonLin (Certara).
  • Table 10.2 shows that 2,3-dihydroxypropyl 1-methyl- D -tryptophanate in its phosphate (NLG-1626) form resulted in significant increase in Cmax (37-153%) and AUC (46-75%), while its hydrocholoride (NLG-1558), and sulfate (NLG-1628) salts resulted in less significant increases in Cmax and AUC.
  • the mesylate salt of 2,3-dihydroxypropyl 1-methyl-D-tryptophanate (NLG-1627) resulted in a decrease in Cmax and AUC, thought this decrease was not statistically significant.
  • Table 10.2 also shows that ethyl N ⁇ -(L-methionyl)-1-methyl-D-tryptophanate (HCl, and phosphate salts, NLG-3272) show a statistically significant increase in Cmax and AUC at doses of 37-500 ⁇ mol/kg.
  • prodrugs that were studied included: a) ethyl N ⁇ -(L-glutaminyl)-1-methyl-D-tryptophanate (free base, HCl, phosphate or mesylate salts), b) N ⁇ -glycyl-1-methyl-D-tryptophan (HCl or phosphate salt), c) methyl N 4 -((R)-1-ethoxy-3-(1-methyl-1 H -indol-3-yl)-1-oxopropan-2-yl)- L -asparaginate (HCl form) and d) N ⁇ -(L-lysyl)-1-methyl-D-tryptophan (free base, HCl, sulfate or phosphate salts).
  • These prodrugs resulted in minor and non-statistically significant variations in the Cmax or AUC for indoximod compared to an equivalent molar dose of indoximod (Table 10.3).
  • Example 9 Pharmacokinetic testing of indoximod prodrug salts in solid capsule formulation in cynomolgous monkeys
  • Capsules were prepared according to the formulation described in Table 9.2. Monkeys were orally dosed with 1 or 3 capsules A (458 ( ⁇ mol/capsule) or 4 capsules B (1032 ⁇ mol/capsule). Blood samples were collected at 0, 5 min, 15 min, 30 min, 1, 2, 4, 8, 12, 24, 26 and 48 h post-dose, and the concentrations of prodrug and indoximod were analyzed by validated LC-MSMS methods.
  • Table 8.1 Cmax and AUC for indoximod after orally dosing rats with solutions of indoximod or its prodrugs Prodrug ID Name Salt form MW (g/mol) Dose (mg/kg) n Cmax ( ⁇ M) Norm. Cmax ( ⁇ M) % Change in Norm. Cmax AUC (0-> ⁇ ) ( ⁇ M.h) Norm.
  • Cmax ( ⁇ M ) maximum concentration of indoximod observed in plasma. Value is the average of n values.
  • Cmax ( ⁇ M ) maximum average concentration of indoximod calculated by multiplying the observed Cmax of indoximod in plasma by the ratio of MW of each prodrug and the MW of indoximod and by the ratio of dose of indoximod and the prodrug (in mg/kg). This normalizes Cmax to the same molar dose ( ⁇ mol/kg). % Change in Norm.
  • AUC (0-> ⁇ ) ( ⁇ M.h ) Area under the curve [indoximod] vs Time observed in plasma. Value is the average of n values.
  • AUC (0-> ⁇ ) ( ⁇ M.h) average AUC calculated by multiplying the observed AUC( 0-> ⁇ ) of indoximod in plasma by the ratio of MW of each prodrug and the MW of indoximod and by the ratio of dose of indoximod and the prodrug (in mg/kg). This normalizes AUC to the same molar dose ( ⁇ mol/kg).

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